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Q.

What is the mass of 0.5 mole of a hydrogen atom?

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a

1.5 g

b

0.5 g

c

2.0 g

d

1 g

answer is D.

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Detailed Solution

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One mole of any substance contains a mass of that whole compound. However, in this case, the question is about 0.5 moles of a substance. The mass of one hydrogen atom is 1 gram hence, the mass for 0.5 moles of hydrogen is,

0.5 mole = 1/2 grams = 0.5 grams.

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